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4.6 Hydraulic characteristics
The hydraulic characteristics represent the
pressure (head) available in the heating
system based on the flow rate.
Head (bar)
0.55
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
Figure 4.4
The load loss for the boiler has already
been subtracted.
Flow rate with the thermostatic cocks
closed
The boiler has an automatic by-pass, which
protects the primary condensate exchanger.
If the circulation of water in the heating sys-
tem decreases too much or totally stops
due to the closure of thermostatic valves or
circuit cocks, the by-pass guarantees a min-
imum circulation of water inside the primary
condensate exchanger.
The by-pass is calibrated for a differential
pressure of approx. 0.3-0.4 bar.
- 30 -
TECHNICAL SPECIFICATIONS
Flow rate (l/h)
4.7 Expansion vessel
The difference in height between the safety
valve and the highest point in the system
can be max. 10 metres.
If differences are greater, increase the pre-
load pressure of the expansion tank and the
cold system by 0.1 bar for each 1 metre in-
crease.
Total capacity
Pre-load pressure
Useful capacity
Maximum system content *
Figure 4.5
* In conditions of:
• Max. average system temperature of
85°C
• Initial temperature when filling the system
10°C.
For systems with contents that
exceed the maximum system
content (indicated in the table),
a
supplementary
tank must be installed.
l
8.0
kPa
100
bar
1.0
l
4.0
l
124
expansion
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